JUST B (저스트비) is a six-member boy group under Bluedot Entertainment. They debuted on June 30, 2021 with their mini album Just Burn. The group is composed of: Lim Jimin (임지민), Geonu (건우), Bain (배인), JM (제이엠), DY (디와이), and Sangwoo (상우). DY and Bain are formers participants of the reality Under Nineteen, which one DY won at first place and debuted as the center in the boy group 1THE9. Geonu and JM are also formers participants of the reality I-LAND, which one debuted the boy group Enhypen.